H muth



Jan. 23, 1934. H, MUTH SUPPORT FOR HIGH FREQUENCY APPARATUS Filed April 11, 1931 INVENTOR HERBERT M TH BY HQ MY/ L/ ATTORNEY Patented Jan. 23, 1934 UNITED STATES PATENT QFFHCE SUPPORT FOR HIGH FREQUENCY APPARATUS Herbert Muth, Berlin,

Germany, assignor to Telefunken Gesellschaft fiir Drahtlose Telegraphic in. b. IL, Berlin, Germany, a corporation of Germany 6 Claims.

This invention relates to an arrangement insuring the insulated suspension or supporting of parts of apparatus operating with radio frequency currents.

In short-wave apparatus such as transmitters, receivers and antennae, the dielectric losses become particularly salient and marked owing to the high frequencies involved, and they can be avoided in constructing these apparatus only by using a minimum amount of insulation material entering in the making of condenser plates, supporting insulators for coils, etc.

According to the present invention, instead of insulation materials for supporting the constituent parts of the apparatus, recourse is had to coilshaped metallic conductors which, owing to their high inductive reactance, remain without influence upon the function of the apparatus. For instance, short-wave antennae or coils of a transmitter or receiver outfit may be suspended from spiral springs in lieu of the supporting insulators heretofore used.

In the sense of this invention, coil-shaped conductors are all conductors whose dimensions result in sufficiently high reactances.

When the point is to insulate a construction element for the combination of radio frequency potentials, direct potentials and low frequency potentials, it will be seen that in the rear of the coil-shaped or helical metallic conductor, a supporting insulator of the usual kind may be inserted in the path of flow of the current.

Embodiments of the basic idea of the invention are illustrated by way of example in Figures 1 and 2 of the accompanying drawing.

Figure 1 shows how the plates of a condenser are borne up or supported by coil-shaped metallic conductors. 1 and 2 denote the two plates of a condenser which by the aid of angle pieces 3 optionally serving also as conductors for the radio frequency energy, are secured to the coilshaped supports 4.

Figure 2 shows by way of example how a coil 1 may be insulated both for direct or unidirectional as well as for radio frequency alternating currents, by coil-shaped or helical metallic conductors 2 and standard supporter insulators. 4 denotes the generator valve device or tube feeding the oscillation circuit, and 5 is the plate poranged in series with an insulator so as to present a high impedance path to the flow of high frequency from the condenser to a lower potential source.

2. The combination with a high frequency inductance coil, of a plurality of vertical supporting reactances consisting of metallic helically shaped coil conductors each having an empty space extending throughout at least a portion of the length of said coil conductors, said reactances being arranged in series with an insulator so as to present a high impedance path to the flow of high frequency from the inductance coil to a lower potential source.

3. The combination with a high frequency apparatus, of a plurality of vertical supporting reactances consisting of metallic helically shaped coil conductors each having an empty space extending throughout at least a major portion of the length of said coil conductors, said reactances being arranged in series with an insulator so as to present a high impedance path to the flow of high frequency from the apparatus to a lower potential source.

4. The combination with high frequency apparatus, of an inductance coil mounted upon a plurality of metallic helically shaped conductors, each of said helically shaped conductors having an empty space extending throughout at least a portion of the length of said conductors, a plurality of insulators for supporting said conductors, a generating source connected to an end of one of said conductors, the other end of said one conductor being connected to said inductance coil, said coil being connected to said high frequency apparatus and said other conductors, said conductors presenting high impedance paths to the flow of the high frequency from said high frequency apparatus to ground.

5. Means for insulating and supporting parts of apparatus carrying alternating radio frequency Cit 6. Means for supporting parts of short wave radio apparatus so as to be insulated from both direct current and radio frequency alternating currents, said means comprising a plurality of vertical supporting reactances consisting of coilshaped metallic conductors arranged in series on top of a direct current insulator.

HERBERT MUTH. 

